Black mimeograph-ink and process of making same.



UNITED STATES PATENT OFFICE.

ROBERT HOCHSTETTER, OF CINCINNATI, OHIO, ASSIGNOR TO AULT & WIBOBG CO.,

OF CINCINNATI, OHIO, .A. CORPORATION OF OHIO.

BLACK MIMEOGRAPH-IN K AND PROCESS OF MAKING SAME.

No Drawing.

To all whom it may concern Be it known that I, ROBERT HooHs'rE'rTER, a citizen of the United States, and a resident of Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Black Mimeograph-Inks and Processes of Making Same; and I do hereby declare that the following is a full, clear, and exact description thereof.

This invention relates to a novel black ink and to the rocess for producing the same. The ink is designed articularly for use on a mimeograph or li e machine, and especially for use on an oscillating or rotary mimeograph, and is intended to overcome certain disadvantages to be found in the mimeograph inks described in Letters Patentof the United States No. 928,195 and 928,450, heretofore granted to me on the 20th day of July, 1909.

The invention consists of the matters hereinafter described and more particularly pointed out in the appended claims.

One of the disadvantages of my prior patented inks resides in the fact that when exposed to the atmosphere, the ink, containing glycerin, will absorb moisture, so that when exposed in damp Weather or in places where a moist temperature maintains, the ink becomes thin in bod and tinctorially weak. As a result, the print made will be broad and weak in character and the letters'will lack that degree of sharpness desirable in order to make the work on the mimeograph approximate the appearance of good work on a typewriting machine, which is the end aimed at in mimeograph Work. In addition, in the case of the said prior ink, if an inked pad were allowed to remain on the m1me0- graph machine, the moisture absorbed by the ink would attack andcorrode the'cylinder with the result that in a comparatively short time the holes in the cylinder would 45 become entirely plugged up, so as to prevent the pad from feeding the ink continuously through the stencil.

In making my improved ink, I take carbon black pigment and a little milori blue pigment (the milori blue or other suitable blue being added to counteract the brown tone inherent in carbon black) and grind the two pigments in a mineral oil of 18 Be. The oil should have tack or viscosity just sufficientto draw the pigment through Specification of Letters Patent. Patented Sept, 19, 1916. Application filed February 4, 1914. Serial N 0. 816,487. I

also tends to prevent lateral spreading of oil in the paper, thus reducing the oily outline to a minimum about the printed characters produced by the mimeograph in the use of the ink.

To illustrate by a specific example how to make my improved ink, I proceed as follows: I take 20 pounds or carbon black, 3 pounds of dry milori blue and 100' pounds of mineral oil of 18 B., and having a specific viscosity of 1.6. This is mixed and ground.. To the ground mixture, I add 200 pounds of some mineral oil, as for example, mineral oil like that first called for, and 40 pounds of Turkey red oil 56% pure and thoroughly mix. This completes the process of making the ink. If desired, in order. 80

-moisture in the atmosphere. The ink produced is. capable of remaining moist in the pad for weeks at a timeand'of feeding continuously through the pad-while at the same time it will not gum or thicken upon exposure to the air. It will set rapidly even on hard surfaced paper,-such as bond paperand. will adhere to the -paper so strongly 100 that it cannot be rubbed after the print has stood over night. The ink flows freely Without the slightest tendency to take on a buttery body, and yet the oily outline, which may appear on thin paper when the printed 1 sheet is held to the light, is reduced to a minimum. The ink is of such construction that it will not affect either the. cylinder or the stencil, will not settle when standing in the can and always remains in the same con- 110 'clition without' any "chemical reaction between its constituent parts. With all these Iclaim'as my mventioni.

1. Theprocess of producing a black ink for mimeographs and the like, consisting in grinding a carbon black igment in a mineral oil, and then adding urkey red. oil.

2. The :process of reducing a black ink for mimeographs an the. like, consisting in grinding carbon black pigment together 'with a small proportion of lue igment in a mineral oiliand'then adding urkey red -3. A black ink. for mimeographs an& the

like, comprisingcarbon black igment, mineral oil and a sulfonated oil. p

4. A black ink for mimeofiraphs and the like, comprising a carbon lack pigment, mineral oil and Turkey red oil.

5. A black ink for mimeographs and the like, comprising carbon black pigment, a small proportion of blue pigment, a mineral oil and Turkey red oil.

In testimony, that I, claim the foregoing as my invention I aflix my si ature in the resenoe of two witnesses, this 19th (iajr oi anuary A. D. 1914.

ROBERT HOCHSTETTEH,

Witnesses:

CHARLES AUL'r Museum, I SIDNEY Anrnnn Wmerrr 

